Implement rebuffering mode for packet-buffer media node.

git-svn-id: svn://10.0.0.236/branches/ZAP_20050610_BRANCH@177937 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/zap/zmk/readme.txt

@@ -70,6 +70,8 @@ Sinks: 1
 Node parameters:
 - int "max_size" : maximum number of packets to buffer (10)
 - int "prefill_size" : no of packets to prebuffer at start of stream (0)
+- boolean "rebuffer" : refill buffer to prefill_size whenever the number
+                       of packets in the buffer drops to 0 (true)
 
 Input stream:
 any

mozilla/zap/zmk/src/zapPacketBuffer.cpp

@@ -105,6 +105,7 @@ zapPacketBuffer::AddedToGraph(zapIMediaGraph *graph,
   // node parameter defaults:
   mPrefillSize = 0;
   mMaxSize = 10;
+  mRebuffer = PR_TRUE;
   // unpack node parameters:
   if (node_pars) {
     node_pars->GetPropertyAsUint32(NS_LITERAL_STRING("prefill_size"), &mPrefillSize);
@@ -114,6 +115,8 @@ zapPacketBuffer::AddedToGraph(zapIMediaGraph *graph,
       NS_WARNING("adjusted maximum buffer size");
       mMaxSize = mPrefillSize;
     }
+
+    node_pars->GetPropertyAsBool(NS_LITERAL_STRING("rebuffer"), &mRebuffer);
   }
 
   return NS_OK;
@@ -724,7 +727,13 @@ zapPacketBufferSink_IDLE::RequestFrame(zapPacketBuffer* pb)
   }
   else {
     // nothing in buffer
-    ChangeState(pb, zapPacketBufferSink_WAITING::Instance());
+#ifdef DEBUG
+    printf("E");
+#endif
+    if (pb->mRebuffer)
+      ChangeState(pb, zapPacketBufferSink_WAITING_PREFILLING::Instance());
+    else
+      ChangeState(pb, zapPacketBufferSink_WAITING::Instance());
   }
   return NS_OK;
 }

mozilla/zap/zmk/src/zapPacketBuffer.h

@@ -93,7 +93,8 @@ private:
   // node parameters (set in zapIMediaGraph::AddNode()):  
   PRUint32 mPrefillSize; // number of packets to prefill the buffer with
   PRUint32 mMaxSize; // maximum number of packets buffered
-
+  PRBool mRebuffer; // rebuffer to prefill_size whenever the number of packets
+                    // in the buffer drops to 0
 
   nsDeque mBuffer; // the actual buffer